ZyWall 5 VPN only connects 1 users???

I have a ZyWall 5 firewall and I am having problems connecting remote users to the VPN I configured.  The ZyWall supports up to 10 connections but every time a remote user connects it kicks off whoever was already logged in?  There are 5 users I would like to have connected and they are connecting from dynamic locations changing all the time to the one main office.  Any help would be great.

Thanks
cgriffith4Asked:
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Rob WilliamsCommented:
I am not familiar with the Zywall units so I had a look at the on-line manuals and a few things to consider:
-each user must have a different local subnet. i.e user 1 might use locally something like 192.168.10.x, user 2 192.168.20.x and so on. If they use the same subnet you can have problems
-for the mobile clients are you using aggressive or main negotiation mode ? Try aggressive , if not using it
-are you making use of the "local user database" on the Zywall ? If so each connection should likely use a different user name if connecting simultaneously
-are there any other routers at the Zywall site, between it and the modem ? If so it could be limiting 1 connection. The modem , especially if a combined modem and router unit might also be doing so, but I have never seen issues with simple modems.
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Rob WilliamsCommented:
Are the remote users connecting from the same site?
If so, this is only possible if your Zywall supports NAT-T. If they are connecting from different sites, it is a different issue.
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cgriffith4Author Commented:
The users will be connecting from different sites all the time which makes this a difficult problem.  Any suggestions?
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Rob WilliamsCommented:
They will be or they are ? If when testing you are doing so from the same site it will almost certainly only allow one connection. However, using multiple sites, with 1 user per site shouldn't be a problem. The issue is each user needs to have a different public IP, unless NAT-T (Network Address Translation - Traversal) is supported and enabled.
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cgriffith4Author Commented:
Sorry.  To be more clear the users are connecting from different locations all the time.  There are 5 users connecting from laptops from different hospitals simultaneously throughout the day.  The current setup works great for 1 user at a time.  As soon as a user connects someone else is bumped off only allowing 1 concurrent connection.  I am having trouble allowing multiple concurrent VPN connections.

Thanks
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Rob WilliamsCommented:
Thanks cgriffith4.
Cheers !
--Rob
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